Patent GB-849908-A (GB)
Title: Improvements in windscreen cleaner operating systems
Inventor: DEIBEL RAYMOND A
IPC: B60S1/48
Filed: 1956-08-29
Abstract: 849,908. Windscreen cleaning systems. TRICO PRODUCTS CORPORATION. Aug. 29, 1956, No. 26429/56. Addition to 801,434. Class 138(1). A windscreen cleaning system comprises a wiper motor 8, Fig. 1, a wiper control 10 for starting or stopping the motor 8, a washer having a liquid pump 24 operable for a time interval, a nozzle 54 receiving liquid under pressure from the pump 24, a co-ordinator 55, 60 which responds to liquid pressure derived from between the pump 24 and the nozzle 54 on discharge of the pump to operate the control 10 to start or accelerate the motor 8, and means 66, Fig. 5, for sustaining liquid pressure for a time interval after discharge of the pump has ceased. The motor 8 is suction operated, the control 10 being a valve also operable manually by a cable 11, a rack and pinion and a control knob 15, and the motor drives wiper arms 5 carrying wiper blades 4, over a panoramic windscreen 1, 2, 3, through a transmission 9, the blades being maintained substantially normal to the windscreen by contour cams 6 co-acting with the wiper arms. The washer includes a reservoir 23 into which depends, from a cover 25, a suctionoperated motor 28 for the pump 24. The motor 28 has a piston 27, Fig. 5, connected to the piston 26, Fig. 1, of the pump 24, which piston 27 is drawn upwardly by suction to effect the intake stroke of the pump and moved downwardly by a spring 29 to effect the discharge of the pump through a tube 30, past a check valve 51, a nipple 52 and a hose 53, Fig. 1, to the nozzles 54. The motor 28, Fig. 5, is controlled by a pair of valves 34, 37 connected by a stem 36 and carried in a valve casing 60, mounted on the cover 25. In the normal position of the valves 34, 37 shown, the chamber of the motor 28 is vented to atmosphere through a lateral passage 95, a clearance space 31 around the stem 36, over the seat 32 of the valve 34 and a vented chamber 33, and the valves are held-up by a spring 35. A suction passage 90 connected to the inlet manifold of the vehicle is connected by a passage 93 to an annular port 38 closed by the valve 37 and by a port 92 with a chamber 44. The chamber 44 is separated from a chamber 45 by a diaphragm 42 carrying a plunger 39 provided with a pressure equalizing port 43. The chamber 45 is connected by a nippel 46 and hose 47, Fig. 1, with a vented chamber provided adjacent the manual knob 15 and normally closed by a valve operable by a rod and push button slidable relative to and coaxially in the knob 15. Under normal conditions the hose 47 and chambers 44, 45 are under the influence of suction owing to the port 43. When the push button control is operated the chamber 45 is vented to atmosphere and owing to the port 43, a pressure differential on opposite sides of the diaphragm 42. causes the plunger 39 to operate the valves 34, 37 so that suction is applied to the pump motor 28 whereby the piston 27 rises and liquid is drawn into the pump the valves being held closed by the motion. At the end of the stroke a spring 94 on the piston 27 trips the valves so that the motor is vented and the spring 29 effects the discharge stroke of the pump. Liquid passing to the nozzles 54 enters a passage 67, and passes into a chamber 66 past a check valve 69. Pressure built-up in the chamber 66 causes a co-ordinator control valve 63, carried by a diaphragm 65, to lift and thus connect the suction passage 90 with a chamber 61, through a port 62. Suction is thus connected through a nipple 59 and a hose 58, Fig. 1, with the co-ordinator motor 55, Fig. 2. The motor 55 has an arm 73 slidable in a post 74 on the wiper motor 8 and slidable in the arm 73 is a piston rod 75 for a piston 56 under the urge of a spring 57. The rod 75 is positively connected for push and pull to the motor valve 10 and the arm 73 has a shoulder 76 which slidably guides the manual control cable 11 provided with an enlarged end. Since the co-ordinator motor 53 has a vent 96, application of suction will cause the motor to move to the right until the shoulder 76 abuts the port 73 whereafter the piston rod moves the valve 10 to left to its maximum open position. When the washer pump 24 has completed its discharge stroke the liquid in the chamber 66 can only be released slowly, through an adjustable needle valve (not shown) on the casing 60 so that the motor spring 57 does not return the valve 10 to the " OFF " position or to the position in which it may have been set manually by the knob 15 and shoulder 76 until the valve 63 is closed by a spring 71. A vacuum-sustaining valve elastic sleeve 78 is provided in the chamber 61 and engageable around the stem 64 for the valve 63. The system may be operable by other forms of fluid-pressure or electrically, in which latter case switches, for opening and closing electric circuits corresponding to the illustrated fluid circuits would replace valves. Specification 819,131 is referred to. Reference has been directed by the Comptroller to Specifications 662,241, 667,656 and 736,380.